:root {
            --primary-color: #2563eb;
            --primary-light: #3b82f6;
            --secondary-color: #f97316;
            --text-dark: #1e293b;
            --text-gray: #64748b;
            --bg-light: #f8fafc;
            --white: #ffffff;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
        }
        
        body {
            color: var(--text-dark);
            background-color: var(--white);
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏样式 */
        .navbar-container {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 50;
            transition: padding 0.3s ease;
        }
        
        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(8px);
            border: 1.5px solid var(--primary-color);
            border-radius: 9999px;
            padding: 8px 20px;
            box-shadow: var(--shadow);
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        
        .logo-img {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background-color: var(--white);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-dark);
        }
        
        .nav-links {
            display: none;
            gap: 40px;
        }
        
        @media (min-width: 768px) {
            .nav-links {
                display: flex;
                align-items: center;
            }
        }
        
        .nav-link {
            color: var(--text-dark);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
        }
        
        .nav-link:hover {
            color: var(--primary-color);
        }
        
        .pro-button {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 6px 12px;
            background: linear-gradient(to right, var(--secondary-color), #ef4444);
            color: white;
            border-radius: 9999px;
            font-weight: 500;
            font-size: 14px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .pro-button:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        
        .download-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 9999px;
            padding: 12px 24px;
            font-size: 18px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        
        .download-btn:hover {
            background-color: var(--primary-light);
        }
        
        /* 英雄区域 */
        .hero {
            padding: 120px 0 80px;
        }
        
        .hero-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            align-items: center;
        }
        
        @media (min-width: 768px) {
            .hero-content {
                grid-template-columns: 1fr 1fr;
            }
        }
        
        .hero-text {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        
        .hero-title {
            font-size: 48px;
            font-weight: 800;
            line-height: 1.2;
        }
        
        .highlight {
            color: var(--primary-color);
        }
        
        .hero-desc {
            font-size: 20px;
            color: var(--text-gray);
            max-width: 500px;
        }
        
        .hero-cta {
            margin-top: 20px;
        }
        
        .hero-img {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            width: 100%;
        }
        
        .hero-img img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        .platform-note {
            color: var(--text-gray);
            padding-left: 10px;
            font-size: 14px;
        }
        
        /* 核心功能区 */
        .core-features {
            background-color: var(--bg-light);
            border-radius: 24px;
            padding: 60px 20px;
            margin-bottom: 80px;
        }
        
        .section-header {
            max-width: 800px;
            margin: 0 auto 40px;
            text-align: center;
        }
        
        .section-title {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        
        .section-desc {
            font-size: 18px;
            color: var(--text-gray);
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
        }
        
        @media (min-width: 768px) {
            .features-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        
        .feature-card {
            background-color: var(--white);
            border-radius: 16px;
            padding: 24px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
        }
        
        .feature-img {
            border-radius: 8px;
            overflow: hidden;
            margin-bottom: 16px;
        }
        
        .feature-img img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        .feature-title {
            font-size: 20px;
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 8px;
        }
        
        .feature-desc {
            color: var(--text-gray);
        }
        
        /* 详细功能区 */
        .feature-detail {
            margin-bottom: 80px;
            opacity: 1;
            transform: translateY(0) scale(1);
            transition: all 0.5s ease;
        }
        
        .feature-detail-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            align-items: center;
        }
        
        @media (min-width: 768px) {
            .feature-detail-content {
                grid-template-columns: 1fr 1fr;
            }
        }
        
        .feature-detail-text {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        
        .feature-detail-title {
            font-size: 32px;
            font-weight: 700;
        }
        
        .feature-detail-desc {
            font-size: 18px;
            color: var(--text-gray);
            line-height: 1.8;
        }
        
        .pro-badge {
            display: inline-block;
            padding: 4px 12px;
            background: linear-gradient(to right, var(--primary-color), var(--primary-light));
            color: white;
            border-radius: 9999px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        
        .feature-detail-img {
            display: flex;
            justify-content: center;
        }
        
        .feature-detail-img img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        
        /* 适用人群 */
        .personas {
            margin-bottom: 80px;
        }
        
        .personas-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 40px;
        }
        
        .persona-card {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            gap: 16px;
        }
        
        .persona-icon {
            width: 96px;
            height: 96px;
            background-color: var(--bg-light);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 8px;
        }
        
        .persona-icon svg {
            width: 48px;
            height: 48px;
            color: var(--text-dark);
        }
        
        .persona-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        
        .persona-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
            margin-bottom: 16px;
        }
        
        .persona-tag {
            padding: 4px 16px;
            border: 1px solid var(--primary-color);
            border-radius: 9999px;
            color: var(--primary-color);
            background-color: rgba(37, 99, 235, 0.1);
            font-size: 12px;
        }
        
        .persona-desc {
            color: var(--text-gray);
        }
        
        /* 用户评价 */
        .testimonials {
            margin-bottom: 80px;
            overflow: visible;
        }
        
        .testimonials-container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
        }
        
        @media (min-width: 768px) {
            .testimonials-container {
                grid-template-columns: 2fr 5fr;
            }
        }
        
        .testimonials-header {
            max-width: 300px;
        }
        
        .testimonials-slider {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            padding-bottom: 20px;
            scrollbar-width: thin;
            scrollbar-color: #cbd5e1 transparent;
        }
        
        .testimonials-slider::-webkit-scrollbar {
            height: 6px;
        }
        
        .testimonials-slider::-webkit-scrollbar-thumb {
            background-color: #cbd5e1;
            border-radius: 9999px;
        }
        
        .testimonials-slider::-webkit-scrollbar-track {
            background: transparent;
        }
        
        .testimonial-card {
            flex: 0 0 320px;
            background-color: var(--bg-light);
            border-radius: 16px;
            padding: 24px;
            height: 280px;
            display: flex;
            flex-direction: column;
        }
        
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
        }
        
        .author-avatar {
            width: 50px;
            height: 50px;
            border-radius: 8px;
            overflow: hidden;
        }
        
        .author-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .author-info {
            display: flex;
            flex-direction: column;
        }
        
        .author-name {
            font-weight: 600;
            font-size: 18px;
        }
        
        .author-title {
            font-size: 14px;
            color: var(--text-gray);
        }
        
        .testimonial-text {
            flex-grow: 1;
            color: var(--text-gray);
            font-size: 16px;
        }
        
        /* CTA区域 */
        .cta-section {
            background-color: var(--text-dark);
            color: var(--white);
            border-radius: 24px;
            padding: 60px 20px;
            margin-bottom: 80px;
        }
        
        .cta-content {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            align-items: center;
        }
        
        @media (min-width: 768px) {
            .cta-content {
                grid-template-columns: 2fr 1fr;
            }
        }
        
        .cta-text {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        
        .cta-title {
            font-size: 40px;
            font-weight: 700;
        }
        
        .cta-desc {
            font-size: 18px;
            color: #94a3b8;
        }
        
        .cta-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 9999px;
            padding: 16px 32px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            width: fit-content;
        }
        
        .cta-btn:hover {
            background-color: var(--primary-light);
        }
        
        .cta-img {
            display: flex;
            justify-content: center;
        }
        
        .cta-img img {
            max-width: 100%;
            height: auto;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--bg-light);
            padding: 60px 0 30px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
        }
        
        .footer-logo img {
            width: 24px;
            height: 24px;
        }
        
        .footer-logo-text {
            font-weight: 700;
            font-size: 18px;
        }
        
        .footer-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        
        .footer-link {
            color: var(--text-gray);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-link:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        
        .footer-contact {
            color: var(--text-gray);
        }
        
        .qrcode-container {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        
        .qrcode-desc {
            color: var(--text-gray);
            font-size: 14px;
        }
        
        .qrcode-img {
            width: 150px;
            height: 150px;
            background-color: var(--white);
            padding: 8px;
            border-radius: 8px;
        }
        
        .qrcode-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .footer-bottom {
            border-top: 1px solid #e2e8f0;
            padding-top: 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            align-items: center;
            text-align: center;
            font-size: 14px;
            color: var(--text-gray);
        }
        
        @media (min-width: 768px) {
            .footer-bottom {
                flex-direction: row;
                justify-content: center;
                gap: 20px;
            }
        }
        
        .footer-link-external {
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .footer-link-external:hover {
            text-decoration: underline;
        }
        
        /* 语言切换按钮 - 修改后的样式 */
        .lang-switch {
            background-color: transparent;
            border: 1px solid var(--primary-color);
            border-radius: 9999px;
            padding: 6px 12px;
            cursor: pointer;
            font-weight: 500;
            transition: var(--transition);
            color: var(--text-dark);
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        
        .lang-switch:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        /* 移动端适配 */
        @media (max-width: 767px) {
            .lang-switch {
                position: fixed;
                bottom: 20px;
                right: 20px;
                z-index: 100;
                box-shadow: var(--shadow);
                background-color: var(--white);
            }
        }

/* Keep the language control available on small screens */
@media (max-width:767px){
  .nav-links{display:contents}
  .nav-links>.nav-link,.nav-links>.pro-button{display:none}
  .nav-links>.lang-switch{display:flex}
}

/* Compact mobile header: body CTA remains the download entry */
@media (max-width:767px){
  .navbar>a:last-child{display:none}
  .nav-links>.lang-switch{position:static;inset:auto;margin-left:auto;box-shadow:none;padding:6px 10px}
}